Gauge for measuring internal dimensions



Dec. 26, 1922. v 1,439,989

F. A. AVANDER ET AL.

GAUGE FOR MEASURING INTERNAL DIMENSIONS.

FILED AUG. 4, 1920.

Patented Dee. 2d, 1922.

lAZittQ FRITZ ANDEHS .avnnnnn, nrrsnrann nose masses, AND CLAES cnoiae EKMAN, or

ESKILSTUNA, swnnnn, Assreiuons TO AKTIEBQLAGET c. n rormnsson, or ESKIL- STUNA, swnnnn, n MANUFACTURING-l COMPANY or swnnnn.

GAUGE FOR MEASURING INTERNAL DIMENSIONS.

Application filed August 4, 1320. SeriaI No. 401,189.

To (ZZZ who/1t may concern Be it known that we, Furry, .lrnnnns i'lvan type which are provided with two measur ing studs placed in alignment and movable longitudinallyin the frame of the gauge. the inner ends of said studs being cut off obliquely, and with a conical or wedgeshaped member projecting in between and engaging the said ends of said studs and movable at right angles to said studs for the purpose Ol? moving the studs apart when their outer ends or measuring surfaces have become worn. In gauges of this lrindas heretofore known the movement of the last mentioned member is generally effected by means of a screw threaded into the frame or handle of the gauge, which screw isadapted, when tightened for moving the studs apart, to push the conical or wedge-shaped member in between the studs. In order to render accurate measuring possible, however, the studs must fit very tightly in their guides in the frame, and therefore said studs and in a still higher degree, the wedgeshaped member will. offer a rather considerable resistance to the said movement. This will result in the portion of the frame surrounding the studs being subjected to rather stresses which may easily cause appreciable distortions of urlng.

The purpose of the improvement forming the subject of the present invention to avoid or least to decrease as far as possible the said ruinous distortions in gauges as heretofore used. For this purpose the improvement consists in this that the move ment of the conical or wedge-shaped member is efiected by means of a screw screwed into the smaller end of said member and the head of which screw bears against a bearing surface in the portiOIl of the frame surroundcaused by the the frame whereby the gauge becomes useless for accurate meals as; the measuring studs, in such manner that when said screw is tightened for moving the stud apart it exer s a pullingraction on the conical or wedge-shaped member. In this manner it is attained that the stressses be directly taken up by those portions of the frame against which the inner ends of the studs are forced by the wedge-shaped member during theirmoving apart, whereby also the distortion of the. frame is reduced to a minimum.

An embodiment of the invention is illustrated in the accompanying drawing, in which 1 shows a side view partly in section of a gauge according to the invention, and Fig. 2 showsa section on theline jJl B n Fig. i

The frame l of the gauge is preferably made of cast iron and is provided in the usual manner with a handle 5 made for instance ofa piece of tube. The two measuring studs 3 which are made of hardened steel, are placed in alignment in guides in .the frame 1. The ends of the studs projecting outside the frame are provided with heads having measuring surfaces 4:. The inner ends of the studs are provided with oblique or beveled faces 5 opposite one a11- other. A cylindrical member 6 is movable in the frame 1 at right angles to the longi tudinal direction of the studs, and is provided with two'beveled faces 7 diametrically opposite One another, each of said faces bearing against a face 5 on the inner ends of the studs, in such manner that the member 6 acts as a wedge and moves the measuring studs apart when said member. is moved in between the studs, in an upward direction. in Fig.5. 23. Accord in to the nresent invention. tile said movement of the mem her is effected by means of a screw 8 thread ed into the smaller end of the member 6 into a central lon itudinal screw-threaded hole. The screw 1 provided with ahead 9 bean ing against a bearing surface 10 in the franiie fl so that when the screw is rotated it will not be moved longitrulinally. hen the screw is tightened it will thus pull the member 6 in between the measuring studs so as to force the same apart. The stresses caused thereby will be taken up, as will be easily understood from Fig. .2, directly by the perhtening of the screw "will.

as shown in Fig. 1,

in adjusted position by means of a set screw 11 the inner end of which is forced against a plane surface 12 on one side of the stud, In this manner the studs are prevented from turning as Well as from movement in the longitudinal diree- In order to prevent all undue 4dstuds lead plugs tion. justinent of the ineasuri may be applied in the recesses above the headset the screws 8 and 11 and stamped, When it w ll be impossible to effect an adjustment of the measuring studs wlthout destroying said lead plugs.

We claim:

In an intern-e1 gauge, the combination of a frznne heving;- a bearing; surface, measuring studs arranged in alignment in said frame and movable therein towards and away from ene another, the inner ends of said studs having beveled, feces, a substantielly Wedge-shaped member projecting in between and engaging said ends of said studs and movable at right angles to the studs so as to move the same apart, said member having a screw-threaded hole, and a screw threaded into said hole in snidmeinher from its smallest end and provided with a head bearing; against said bearing surface in the portion of the trznne surrounding said studs, so, that when said screw is turned. in one direction fer moving the studs apart it exerts a pulling action on said substantially Wedge-shaped member.

FRITZ ANDEES AVANDE NILS AXEL HUGO NILSSON.

CLAES enone EKMAN 

